feat: power-loss boot resilience for Klubhaus DietPi

- restart: always for stack services
- harden-boot.sh: fsck.repair, panic reboot, hardware watchdog,
  docker+zerotier enabled, klubhaus-stack.service autostart
- kuma-online.sh: push up-heartbeat to Kuma on boot
- RESILIENCE.md documents the Aug 30 failure + apply steps

scripts/harden-boot.sh

@@ -0,0 +1,71 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# Idempotent boot-resilience hardening for the Klubhaus DietPi (run as root).
+# After a power blip the Pi should boot cleanly, repair its fs, restart the
+# stack, and mark itself online in Kuma without human intervention.
+
+BOOT="${BOOT:-/boot}"
+SVC=/etc/systemd/system/klubhaus-stack.service
+BRINGUP=/usr/local/sbin/klubhaus-bringup.sh
+ONLINE=/usr/local/sbin/kuma-online.sh
+
+echo "[1/6] cmdline: fsck.repair + panic reboot"
+if [ -f "$BOOT/cmdline.txt" ]; then
+    for opt in fsck.repair=yes panic=10; do
+        grep -q "$opt" "$BOOT/cmdline.txt" || sed -i "s/$/ $opt/" "$BOOT/cmdline.txt"
+    done
+    echo "  -> $(cat "$BOOT/cmdline.txt")"
+fi
+
+echo "[2/6] watchdog"
+if [ -f "$BOOT/config.txt" ]; then
+    grep -q "dtparam=watchdog=on" "$BOOT/config.txt" || echo "dtparam=watchdog=on" >> "$BOOT/config.txt"
+fi
+sed -i 's/^#RuntimeWatchdogSec=.*/RuntimeWatchdogSec=20/' /etc/systemd/system.conf
+grep -q "^RuntimeWatchdogSec=" /etc/systemd/system.conf || echo "RuntimeWatchdogSec=20" >> /etc/systemd/system.conf
+
+echo "[3/6] enable docker + zerotier"
+systemctl enable docker.service zerotier-one.service 2>/dev/null || true
+
+echo "[4/6] install bringup script"
+cat > "$BRINGUP" <<'EOF'
+#!/usr/bin/env bash
+set -euo pipefail
+while IFS= read -r f; do
+    docker compose -f "$f" up -d
+done < <(find /root -maxdepth 2 -iname 'compose.y*ml' -print 2>/dev/null)
+/usr/local/sbin/kuma-online.sh || true
+EOF
+chmod +x "$BRINGUP"
+
+echo "[5/6] install kuma-online hook"
+if [ -f /root/kuma-online.sh ]; then
+    cp /root/kuma-online.sh "$ONLINE"
+    chmod +x "$ONLINE"
+    echo "  -> installed from /root/kuma-online.sh"
+else
+    echo "  -> WARN: /root/kuma-online.sh not found; skipping (pushers already push)"
+fi
+
+echo "[6/6] install + enable stack service"
+cat > "$SVC" <<'EOF'
+[Unit]
+Description=Bring up Klubhaus docker compose stack and mark online in Kuma
+After=network-online.target docker.service
+Wants=network-online.target docker.service
+
+[Service]
+Type=oneshot
+RemainAfterExit=yes
+ExecStart=/usr/local/sbin/klubhaus-bringup.sh
+
+[Install]
+WantedBy=multi-user.target
+EOF
+systemctl daemon-reload
+systemctl enable klubhaus-stack.service
+
+echo
+echo "Done. A reboot applies cmdline/config.txt changes (fsck + watchdog)."
+echo "Verify after reboot: journalctl -u klubhaus-stack -b"

scripts/kuma-online.sh

@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# Push an "up" heartbeat to every configured Kuma push URL.
+# URLs live in /root/.kuma-push.env (one per line, # for comments).
+ENV_FILE=/root/.kuma-push.env
+
+[ -f "$ENV_FILE" ] || { echo "no $ENV_FILE"; exit 0; }
+
+while IFS= read -r url; do
+    case "$url" in
+        ""|"#"*) continue ;;
+    esac
+    if curl -fsS -G --data-urlencode "status=up" --data-urlencode "msg=pi-online" "$url" >/dev/null 2>&1; then
+        echo "OK  ${url#https://up.notsosm.art/api/push/}"
+    else
+        echo "FAIL ${url#https://up.notsosm.art/api/push/}"
+    fi
+done < "$ENV_FILE"